Chris Somes

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Vasotocin (AVT) promotes courtship in a wide range of vertebrates. However, this effect is not independent of steroid hormones. For example, androgens may work in concert with AVT and corticosterone (CORT) may work to oppose AVT action. In frogs, AVT promotes calling, and in some species, CORT inhibits calling. In addition, androgens are known to modulate(More)
Stress has been reported to influence ethanol consumption and relapse in abstinent alcoholics. The present study examined if prolonged alterations in neurophysiological responses to corticotropin-releasing factor (CRF) and neuropeptide Y (NPY), peptides known to influence stress responses, would persist during protracted ethanol abstinence. Male Wistar rats(More)
Neuropeptide Y (NPY) is a hexatriacontapeptide amide that is now well characterized as a neuromodulator in the central nervous system (CNS). When infused into the CNS, NPY produces both anxiolytic and orexigenic effects. NPY's anxiolytic effects appear to be mediated through receptors in the central amygdala, whereas its orexigenic effects are localized in(More)
Electroencephalograms (EEGs) and event-related potentials (ERPs) to auditory stimuli were recorded following intracerebroventricular administration of neuropeptide Y (saline, NPY: 1.0, 3.0 nmol) in two lines of rats that have been genetically selected for alcohol preferring (P) or non-preferring (NP) behaviors. Previous studies have demonstrated that NPY(More)
Neuropeptide Y (NPY) has neuromodulatory actions on multiple brain functions including endocrine, behavioral, and circadian processes. Behavioral studies suggest that NPY is a potent anxiolytic; however, little is known about how NPY affects general arousal and/or attention states. The present study evaluated the effects of NPY on spontaneous brain activity(More)
Neuropeptide Y (NPY) has neuromodulatory actions on multiple brain functions including endocrine, behavioral, and circadian processes and has been implicated in the pathophysiology of both anxiety and depression. Behavioral studies suggest that NPY is a potent anxiolytic, whereas CRF is anxiogenic, thus it seems that a balance of these two peptides may(More)
Neurotensin is a tridecapeptide, present in the central nervous system and the gastrointestinal tract in man and animals. Previous studies in mice selectively bred for differences in hypnotic sensitivity to ethanol have provided data to suggest that neurotensinergic systems may mediate differences in ethanol's actions in these animals. The present study(More)
Central administration of neuropeptide Y (NPY) in low concentrations has been shown to produce anxiolysis and suppression of locomotor activity, a behavioral profile not dissimilar to that of ethanol. The present study was conducted to ascertain whether NPY and ethanol have similar electrophysiological profiles and to evaluate the combined actions of NPY(More)
The recently isolated Corticotropin Releasing Factor (CRF) related peptide, urocortin, has been reported to elicit a different behavioral profile than that of CRF. CRF is a potent anxiogenic agent and stimulant of motor activity whereas under similar conditions urocortin is a potent anorectic and mild locomotor stimulant. The neurophysiological effects of(More)
The P3, or P300 component of the event-related potentials (ERPs) is a positive going waveform that can be averaged from the EEG approximately 250-500 ms following the presentation of task or context 'relevant' stimuli. This potential has been demonstrated to be a sensitive measure of both normal and abnormal cognitive functioning. P300 models have been(More)